I just replaced my 2007 Corolla with 137K miles, which was totalled by insurance, with 2013 Corolla with 35K miles. I know, based on the records which I found, that previous owner used Synthetic Oil 00279 0w201 01 0w20. I don't have much experience with synthetic oil so my questions are: 1. are synthetic oils compatible ? and 2. what is the recommended interval for oil change? My previous Corollas used dino oil with 5k interval. Thanks a lot for any help.